Firefox 4

Due to changes in the codebase for Firefox 4, FirefoxADM is not compatible.

To fix would require completely re-engineering the way this works. I am reviewing this but due to the amount of work I have on my end, the fact that it is very likely to require the whole code to be re-written, and it finally looks like Mozilla are getting their act together with regards MSIs and Group Policies (6 years late!), it is very likely this is the end of the road for FirefoxADM